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Flying is learning how to throw yourself at the ground and miss.

Simple: Flying is learning how to fall and not hit the ground.

Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.

Simple: People are almost the only animals that can learn from what others do. Another interesting thing about people is that they don't seem to want to.

I don't believe it. Prove it to me and I still won't believe it.

Simple: I do not believe what you say. Show me that it must be true and I will still continue not believing it.

Source: brainyquote.com